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rule win_mirai_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.mirai." info = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.6.0" signator_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.mirai" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" malpedia_license = "CC BY-SA 4.0" malpedia_sharing = "TLP:WHITE" /* DISCLAIMER * The strings used in this rule have been automatically selected from the * disassembly of memory dumps and unpacked files, using YARA-Signator. * The code and documentation is published here: * https://github.com/fxb-cocacoding/yara-signator * As Malpedia is used as data source, please note that for a given * number of families, only single samples are documented. * This likely impacts the degree of generalization these rules will offer. * Take the described generation method also into consideration when you * apply the rules in your use cases and assign them confidence levels. */ strings: $sequence_0 = { e8???????? 50 8d4c2420 e8???????? 8bcd e8???????? 56 } // n = 7, score = 100 // e8???????? | // 50 | push eax // 8d4c2420 | lea ecx, [esp + 0x20] // e8???????? | // 8bcd | mov ecx, ebp // e8???????? | // 56 | push esi $sequence_1 = { ffd2 53 e8???????? 8a442417 83c408 5e 5d } // n = 7, score = 100 // ffd2 | call edx // 53 | push ebx // e8???????? | // 8a442417 | mov al, byte ptr [esp + 0x17] // 83c408 | add esp, 8 // 5e | pop esi // 5d | pop ebp $sequence_2 = { ebc5 8bc3 c1f805 8d3c85c0877400 8bf3 83e61f c1e606 } // n = 7, score = 100 // ebc5 | jmp 0xffffffc7 // 8bc3 | mov eax, ebx // c1f805 | sar eax, 5 // 8d3c85c0877400 | lea edi, [eax*4 + 0x7487c0] // 8bf3 | mov esi, ebx // 83e61f | and esi, 0x1f // c1e606 | shl esi, 6 $sequence_3 = { ff750c ff7508 ff75f8 ff15???????? 8985ecfbffff 83bdecfbffff00 752b } // n = 7, score = 100 // ff750c | push dword ptr [ebp + 0xc] // ff7508 | push dword ptr [ebp + 8] // ff75f8 | push dword ptr [ebp - 8] // ff15???????? | // 8985ecfbffff | mov dword ptr [ebp - 0x414], eax // 83bdecfbffff00 | cmp dword ptr [ebp - 0x414], 0 // 752b | jne 0x2d $sequence_4 = { ff750c ff7508 6a01 8b4df0 e8???????? 8365fc00 8b45f0 } // n = 7, score = 100 // ff750c | push dword ptr [ebp + 0xc] // ff7508 | push dword ptr [ebp + 8] // 6a01 | push 1 // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // e8???????? | // 8365fc00 | and dword ptr [ebp - 4], 0 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_5 = { ff750c e8???????? 59 8b08 8b4004 8b55ec 890a } // n = 7, score = 100 // ff750c | push dword ptr [ebp + 0xc] // e8???????? | // 59 | pop ecx // 8b08 | mov ecx, dword ptr [eax] // 8b4004 | mov eax, dword ptr [eax + 4] // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 890a | mov dword ptr [edx], ecx $sequence_6 = { ff75c8 8b856cfaffff 83c068 50 68???????? 68???????? 68b4030000 } // n = 7, score = 100 // ff75c8 | push dword ptr [ebp - 0x38] // 8b856cfaffff | mov eax, dword ptr [ebp - 0x594] // 83c068 | add eax, 0x68 // 50 | push eax // 68???????? | // 68???????? | // 68b4030000 | push 0x3b4 $sequence_7 = { 8d45e8 50 8b4de4 83c124 e8???????? 50 8d4df0 } // n = 7, score = 100 // 8d45e8 | lea eax, [ebp - 0x18] // 50 | push eax // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 83c124 | add ecx, 0x24 // e8???????? | // 50 | push eax // 8d4df0 | lea ecx, [ebp - 0x10] $sequence_8 = { ff30 e8???????? 59 8b45f8 832000 8b45f8 83600400 } // n = 7, score = 100 // ff30 | push dword ptr [eax] // e8???????? | // 59 | pop ecx // 8b45f8 | mov eax, dword ptr [ebp - 8] // 832000 | and dword ptr [eax], 0 // 8b45f8 | mov eax, dword ptr [ebp - 8] // 83600400 | and dword ptr [eax + 4], 0 $sequence_9 = { ff2485d4714800 837f0800 750b c7070c000000 e9???????? 83fe10 7323 } // n = 7, score = 100 // ff2485d4714800 | jmp dword ptr [eax*4 + 0x4871d4] // 837f0800 | cmp dword ptr [edi + 8], 0 // 750b | jne 0xd // c7070c000000 | mov dword ptr [edi], 0xc // e9???????? | // 83fe10 | cmp esi, 0x10 // 7323 | jae 0x25 condition: 7 of them and filesize < 7086080 }
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